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- Question
What will be the output of the program?
#include<stdio.h> int fun(int **ptr); int main() { int i=10; const int *ptr = &i; fun(&ptr); return 0; } int fun(int **ptr) { int j = 223; int *temp = &j; printf("Before changing ptr = %5x\n", *ptr); const *ptr = temp; printf("After changing ptr = %5x\n", *ptr); return 0; }
Options- A. Address of i
Address of j - B. 10
223 - C. Error: cannot convert parameter 1 from 'const int **' to 'int **'
- D. Garbage value
- Correct Answer
- Error: cannot convert parameter 1 from 'const int **' to 'int **'
- 1. A function that receives variable number of arguments should use va_arg() to extract the last argument from the variable argument list.
Options- A. True
- B. False Discuss
- 2. Bitwise & can be used to check if more than one bit in a number is on.
Options- A. True
- B. False Discuss
- 3. The preprocessor can trap simple errors like missing declarations, nested comments or mismatch of braces.
Options- A. True
- B. False Discuss
- 4. It is necessary that a header files should have a .h extension?
Options- A. Yes
- B. No Discuss
- 5. Bitwise | can be used to set multiple bits in number.
Options- A. Yes
- B. No Discuss
- 6. Bitwise & can be used to check if a bit in number is set or not.
Options- A. True
- B. False Discuss
- 7. A pointer union CANNOT be created
Options- A. Yes
- B. No Discuss
- 8. What will be the output of the program?
#include<stdio.h> #include<stdlib.h> int main() { union test { int i; float f; char c; }; union test *t; t = (union test *)malloc(sizeof(union test)); t->f = 10.10f; printf("%f", t->f); return 0; }
Options- A. 10
- B. Garbage value
- C. 10.100000
- D. Error Discuss
- 9. What will be the output of the program?
#include<stdio.h> int main() { int x=4, y, z; y = --x; z = x--; printf("%d, %d, %d\n", x, y, z); return 0; }
Options- A. 4, 3, 3
- B. 4, 3, 2
- C. 3, 3, 2
- D. 2, 3, 3 Discuss
- 10. Functions cannot return a floating point number
Options- A. Yes
- B. No Discuss
More questions
Correct Answer: False
Correct Answer: True
Correct Answer: False
Explanation:
False, the preprocessor cannot trap the errors, it only replaces the macro with the given expression. But the compiler will detect errors.
Correct Answer: No
Explanation:
No, the header files have any kind of extension.
Correct Answer: Yes
Correct Answer: True
Correct Answer: No
Correct Answer: 10.100000
Correct Answer: 2, 3, 3
Explanation:
Step 1: int x=4, y, z; here variable x, y, z are declared as an integer type and variable x is initialized to 4.
Step 2: y = --x; becomes y = 3; because (--x) is pre-decrement operator.
Step 3: z = x--; becomes z = 3;. In the next step variable x becomes 2, because (x--) is post-decrement operator.
Step 4: printf("%d, %d, %d\n", x, y, z); Hence it prints "2, 3, 3".
Step 2: y = --x; becomes y = 3; because (--x) is pre-decrement operator.
Step 3: z = x--; becomes z = 3;. In the next step variable x becomes 2, because (x--) is post-decrement operator.
Step 4: printf("%d, %d, %d\n", x, y, z); Hence it prints "2, 3, 3".
Correct Answer: No
Explanation:
A function can return floating point value.
Example:
#include <stdio.h>
float sub(float, float); /* Function prototype */
int main()
{
float a = 4.5, b = 3.2, c;
c = sub(a, b);
printf("c = %f\n", c);
return 0;
}
float sub(float a, float b)
{
return (a - b);
}
Output:
c = 1.300000
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